package com.itheima.reggie.filter;

import com.alibaba.fastjson.JSON;
        import com.itheima.reggie.common.R;
import com.itheima.reggie.common.UserHolder;
import com.itheima.reggie.entity.Employee;
import com.itheima.reggie.entity.User;
import lombok.extern.slf4j.Slf4j;
        import org.springframework.util.AntPathMatcher;

        import javax.servlet.*;
        import javax.servlet.annotation.WebFilter;
        import javax.servlet.http.HttpServletRequest;
        import javax.servlet.http.HttpServletResponse;
        import java.io.IOException;

//@WebFilter(filterName = "filter_login",urlPatterns = "/*")
//@Slf4j
//public class filter_login implements Filter{
//
//    @Override
//    public void init(FilterConfig filterConfig) throws ServletException {
//
//    }
//
//    @Override
//    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
//        String[] uris= {
//                "/employee/login",
//                "/employee/logout",
//                "/backend/**",
//                "/front/**"
//        };
//        HttpServletRequest req = (HttpServletRequest) servletRequest;
//        String requestURI = req.getRequestURI();
//        AntPathMatcher antPathMatcher = new AntPathMatcher();
//        for (String s : uris) {
//            boolean match = antPathMatcher.match(s, requestURI);
//            if(match){
//                filterChain.doFilter(servletRequest,servletResponse);
//            }
//        }
//        Object employee = req.getSession().getAttribute("employee");
//        if(employee!=null){
//            filterChain.doFilter(servletRequest,servletResponse);
//        }
////        req.getRequestDispatcher("/login.html").forward(servletRequest, servletResponse);
//    }
//
//    @Override
//    public void destroy() {
//
//    }
//}




@WebFilter(filterName = "filter_login",urlPatterns = "/*")
@Slf4j
public class filter_login implements Filter{
    //路径匹配器，支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        //1、获取本次请求的URI
        String requestURI = request.getRequestURI();// /backend/index.html

        log.info("拦截到请求：{}",requestURI);

        //定义不需要处理的请求路径
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/user/sendMsg",
                "/user/login",
                "/backend/**",
                "/front/**"
        };

        //2、判断本次请求是否需要处理
        boolean check = check(urls, requestURI);

        //3、如果不需要处理，则直接放行
        if(check){
            log.info("本次请求{}不需要处理",requestURI);
            filterChain.doFilter(request,response);
            return;
        }

        //4、判断登录状态，如果已登录，则直接放行
        if(request.getSession().getAttribute("employee") != null){
            log.info("管理员已登录，用户id为：{}",request.getSession().getAttribute("employee"));
            filterChain.doFilter(request,response);
//            UserHolder.setEmployee((Employee)request.getSession().getAttribute("employee"));
            return;
        }

        if(request.getSession().getAttribute("user") != null){
            User user = (User)request.getSession().getAttribute("user");
            log.info("用户已登录，用户id为：{}",user.getId());
            UserHolder.setUser(user);
            filterChain.doFilter(request,response);
            UserHolder.releaseUser();
            return;
        }

        log.info("用户未登录");
        //5、如果未登录则返回未登录结果，通过输出流方式向客户端页面响应数据
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;

    }


    /**
     * 路径匹配，检查本次请求是否需要放行
     * @param urls
     * @param requestURI
     * @return
     */
    public boolean check(String[] urls,String requestURI){
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI);
            if(match){
                return true;
            }
        }
        return false;
    }
}

///user/login
//        /user/sendMsg